@article{1363407,
      author = {Sheffield, Linda Jensen, and Liegl, Kylee, and Coster,  Barbara, and Miller, Tracy E.,},
      url = {http://library.usi.edu/record/1363407},
      title = {Extending the challenge in mathematics : developing  mathematical promise in K-8 students /},
      recid = {1363407},
      pages = {1 online resource (161 pages) :},
}